Question about 1995 GMC Sierra C1500

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95 GMC 4x4, 5.7L V8, engine shakes, looses power, and misses when hot after driving for awhile or pulling a travel trailer.

The truck runs fine when it is cold or damp out, only does this when weather is warmer or engine is hotter. Which means it runs fine in the winter months and acts up in the summer months. The spark plugs, distubutor cap, wires all have been recently changed and did not make a difference. Also when pulling a travel trailer, as the engine heats up, the vibration and shaking get worse and transmission fluid comes out under the truck somewhere and sprays the front of the trailer. In order to keep driving the truck has to be shut off for hours to cool down. My mechanic is stumped, nothing has led to the computer, because when a computer acts up eventually it will just quit. This has been going on for a year. Any ideas? thanks

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6 Suggested Answers

6ya6ya

6ya staff

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SOURCE:

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Posted on Jan 02, 2017

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Anonymous

  • 113 Answers

SOURCE: Running rich and lean

the codes ur getting will be thrown by a vacume leak make sure u dont have a vacume line leaking or split also check ur pcv valve for clogging

Posted on Jun 18, 2008

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Anonymous

  • 231 Answers

SOURCE: 2001 GMC Sonoma Engine stopped while driving

sounds like it could be plugged injectors or a timing problem.

Posted on Oct 27, 2008

Anonymous

  • 1 Answer

SOURCE: 78 GMC losing power

I had the same thing on a 73 vega yes a vega don,t laugh to hard it was a super car, it started not to go when I shifted gears and ask for more fuel I had a guy at the shell station look at it and replaced the fuel fliter, it worked,, maybe the pump was replaced but not the filter

Posted on Jan 08, 2009

Anonymous

  • 202 Answers

SOURCE: Engine Coolant

First make sure you have no air in the system, and coolant level is full. Then with the engine idling make sure the fan turns on at running temperature. If it does not this is what is causing the over heating problem.

Posted on Mar 30, 2009

ftw1952

frank thomas wilson

  • 10319 Answers

SOURCE: 2002 GMC Sonoma shakes

fan clutch may have a bad bearing or it is a cracked flywheel

Posted on May 27, 2009

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1 Answer

Cool mornings it doesn't want to start ,i have to turn the key to start and let it off several times and it will eventually start after that it starts fine all day and starts fine on warm days


How to Start a Car in Freezing Cold Winter Weather

www.wikihow.com > ... > Cars > Car Maintenance and Repair

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Why is it so hard to start a car in the winter? - HowStuffWorks

auto.howstuffworks.com/car-driving-safety/.../start-car-in-winter.htm
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Debunking 5 Cold-Weather Car Myths - Popular Mechanics


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1 Answer

No spark in cold weather


what engine, what country. what year, (3 strikes, and out)
we cant guess. 2001 to 2014.
4.7 L 240 hp (179 kW) V8 (2001-04)
4.7 L 282 hp (210 kW) V8 with VVT-i (2005)
4.7 L 273 hp (204 kW) V8 with VVT-i (2006-07)
no spark at all cylinders, check them all.
if all are dead, the $9 scan tool tells me why, with DTC Pxxxx
ever done a tune up ever? if not , why not now.
tune ups, correct bad spark and bad filters.

no spark winter, that is because, its cold and damp
and spark parts just hate damp when parts are old, 1920 to now.
If it runs now.
is the CEL glowing at any time running.
yes, why not scan it, got P0300s or P0301 to 8?
bingo

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Most vehicles have a cold or damp weather vacuum system diaphragm or sensor of some sort. Check the vacuum system for leaks, loose hoses, rusted diaphragms etc replace what is rusted out or broken.

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Engine starts , and dies. Only when weather is cold.


hello there
I looks like your oxygen sensor,Try to disconnect and then see what the car does?Let me know.You may need to adjust the fuel mixure,seem it is running a little rich that is why the car in idle goes up and down.
proporsche@yahoo.com

proporsche

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1 Answer

We don't the maintenance book - what kind of oil does a 1998 Plymouth Neon take? Thank you


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1 Answer

Starting in damp weather 1993 240 wagon, auto/od, 235k miles


perhaps you need a new cap and roter a new spark plug wire set. they don;t like moisture. also check to see if you have any broken or leaking vacuum hoses. the worse case senerio would be that your head gasket is leaking--at cold temps a little antifreeze will enter until everything warms up and it seals shut due to metal expanding. but since you say it's cold weather only--this probably wou;dn't be the case. good luck.

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1 Answer

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